WASHINGTON, DC - JULY 12: (AFP OUT) With U.S. President Barack Obama and first lady Michelle Obama on board, Marine One is accompanied by two other helicopters from Marine Helicopter Squadron One before landing on the South Lawn of the White House with July 12, 2016 in Washington, DC. The Obamas were returning from Dallas where they attended a public memorial service for the five Dallas police officers who were killed by a sniper last week during a Black Lives Matter demonstration. (Photo by Chip Somodevilla/Getty Images)

Members and supporters of the US Congressional LGBT Equality Caucus, including House Minority Whip Steny Hoyer (R), Democratic Representative from South Carolina Jim Clyburn (2nd R) and Democratic Representative from California Mark Takano (2nd L) hold pictures of victims of the Pulse nightclub attack, one month after a gunman killed 49 people at the club in Orlando, Florida, during a vigil on the East House steps of the US Capitol in Washington, DC, on July 12, 2016. / AFP PHOTO / NICHOLAS KAMMNICHOLAS KAMM/AFP/Getty Images

*** BESTPIX *** WASHINGTON, DC - JULY 12: House Speaker Paul Ryan (R-WI), (C), speaks while flanked by House Republican leaders on Capitol Hill July 12, 2016 in Washington, DC. Speaker Ryan announced the House GOP's-election-year agenda. (Photo by Mark Wilson/Getty Images)

WASHINGTON, DC - JULY 12: Neil Sroka, Communications Director, Deomcracy for America, joins members of MoveOn.org and members of Congress convene at an event to demand congress renew an assualt weapons ban, along with delivering more than one million signed petitions, at United States Capitol Building on July 12, 2016 in Washington, DC. (Photo by Leigh Vogel/Getty Images for MoveOn.org)

WASHINGTON, DC - JULY 12: Benjamin O'Keefe, Social and Cultural Producer, W, MoveOn.org, joins members of MoveOn.org and members of Congress convene at an event to demand congress renew an assualt weapons ban, along with delivering more than one million signed petitions, at United States Capitol Building on July 12, 2016 in Washington, DC. (Photo by Leigh Vogel/Getty Images for MoveOn.org)

WASHINGTON, DC - JULY 12: Ben Wikler, Washington Director, MoveOn.org, joins members of MoveOn.org and members of Congress convene at an event to demand congress renew an assualt weapons ban, along with delivering more than one million signed petitions, at United States Capitol Building on July 12, 2016 in Washington, DC. (Photo by Leigh Vogel/Getty Images for MoveOn.org)

WASHINGTON, DC - JULY 12: Mark Carman, Executive Director, American Coalition for Responsible Gun Owners, joins members of MoveOn.org and members of Congress convene at an event to demand congress renew an assualt weapons ban, along with delivering more than one million signed petitions, at United States Capitol Building on July 12, 2016 in Washington, DC. (Photo by Leigh Vogel/Getty Images for MoveOn.org)

WASHINGTON, DC - JULY 12: Ben Wikler, Washington Director, MoveOn.org, joins members of MoveOn.org and members of Congress convene at an event to demand congress renew an assualt weapons ban, along with delivering more than one million signed petitions, at United States Capitol Building on July 12, 2016 in Washington, DC. (Photo by Leigh Vogel/Getty Images for MoveOn.org)